diff --git a/src/Azure.DataApiBuilder.Mcp/BuiltInTools/AggregateRecordsTool.cs b/src/Azure.DataApiBuilder.Mcp/BuiltInTools/AggregateRecordsTool.cs
index 16edaaebe4..1162d1ed9e 100644
--- a/src/Azure.DataApiBuilder.Mcp/BuiltInTools/AggregateRecordsTool.cs
+++ b/src/Azure.DataApiBuilder.Mcp/BuiltInTools/AggregateRecordsTool.cs
@@ -133,7 +133,11 @@ public class AggregateRecordsTool : IMcpTool
                     },
                     ""required"": [""entity"", ""function""]
                 }"
-            )
+            ),
+            Annotations = new ToolAnnotations()
+            {
+                ReadOnlyHint = true
+            }
         };
 
         /// <summary>
diff --git a/src/Azure.DataApiBuilder.Mcp/BuiltInTools/DescribeEntitiesTool.cs b/src/Azure.DataApiBuilder.Mcp/BuiltInTools/DescribeEntitiesTool.cs
index 9a700c95bb..05e7bee04d 100644
--- a/src/Azure.DataApiBuilder.Mcp/BuiltInTools/DescribeEntitiesTool.cs
+++ b/src/Azure.DataApiBuilder.Mcp/BuiltInTools/DescribeEntitiesTool.cs
@@ -57,7 +57,11 @@ public Tool GetToolMetadata()
                             }
                         }
                     }"
-                )
+                ),
+                Annotations = new ToolAnnotations()
+                {
+                    ReadOnlyHint = true
+                }
             };
         }
 
diff --git a/src/Azure.DataApiBuilder.Mcp/BuiltInTools/ReadRecordsTool.cs b/src/Azure.DataApiBuilder.Mcp/BuiltInTools/ReadRecordsTool.cs
index 8da3c4856a..62216604a3 100644
--- a/src/Azure.DataApiBuilder.Mcp/BuiltInTools/ReadRecordsTool.cs
+++ b/src/Azure.DataApiBuilder.Mcp/BuiltInTools/ReadRecordsTool.cs
@@ -71,7 +71,11 @@ public Tool GetToolMetadata()
                         },
                         ""required"": [""entity""]
                     }"
-                )
+                ),
+                Annotations = new ToolAnnotations()
+                {
+                    ReadOnlyHint = true
+                }
             };
         }